Let the Pope say what I want to say today...
“Peter was a sinner, but not corrupt, eh? Sinners, yes, everyone: corrupt, no. I once knew of a priest, a good parish pastor who worked well. He was appointed bishop, and he was ashamed because he did not feel worthy, he had a spiritual torment. And he went to the confessor. The confessor heard him and said, ‘But do not worry. If after the [mess Peter made of things], they made him Pope, then you go ahead! .’ The point is that this is how the Lord is. That’s the way He is. The Lord makes us mature with many meetings with Him, even with our weaknesses, when we recognize [them], with our sins.”
Pope Francis went on to say that Peter let himself be shaped by his many encounters with Jesus, and that this, he said, “is something we all need to do as well, for we are on the same road.” The Holy Father stressed that Peter is great, not because he is good, but because he has a nobility of heart, which brings him to tears, leads him to this pain, this shame - and also to take up his work of shepherding the flock”:
Text from page http://en.radiovaticana.va/news/2013/05/17/pope_francis_celebrates_friday_morning_mass/en1-692959
of the Vatican Radio website